The Quarterly journal of the Geological Society of London . rs, partly because there is asmall patelloid convexity above the pre-cnemial crest, then a trans-verse concavity, behind which is the larger part of the articulation,consisting of two areas which correspond to condyles. These surfacesare divided by a shallow groove, and the larger condyle was on theexternal border. The posterior angles of these condylar surfaces arerounded and prolonged backward beyond the shaft, and there is aslight concavity between them. The proximal end of the bone is expanded as compared with theunusually slender
The Quarterly journal of the Geological Society of London . rs, partly because there is asmall patelloid convexity above the pre-cnemial crest, then a trans-verse concavity, behind which is the larger part of the articulation,consisting of two areas which correspond to condyles. These surfacesare divided by a shallow groove, and the larger condyle was on theexternal border. The posterior angles of these condylar surfaces arerounded and prolonged backward beyond the shaft, and there is aslight concavity between them. The proximal end of the bone is expanded as compared with theunusually slender sub-cylindrical shaft, which is 12 millim. indiameter. The anterior internal surface, though flattened, is gentlyconvex, and it rounds into the posterior surface of the bone, as well a^on to the strong anterior convex ridge of the pre-cnemial crest, whichis prolonged down the shaft for about 6 cm. with a gently convex * See Proc. Eoy. Soc. vol. xliii. p. 165, and Quart. Journ. Geol. See, vol. xliv.(1888) p. 70. (I J. CJ. S. vol. [To face [k \r,.\. EXPLANATION OF FIGUEES. Affrosaurus Macgillivrayi (Seelej).^ natural size.^^g. 1. Left tibia-flbular aspect, showing expansion of the ends of the 2. Left tibia-anterior aspect, with lateral notch for the 3. Proximal articulation, showing impress of condjles of 4. Distal articulation, showing distinctive quadrate form and attachmentlor astragalus. y\E. 5. Section of .shaft, showing ite cylindrical rt. Claw plialango. ritOF. II. (i. SKKLEY ON AGKOSAUKUS MAC(i ILLIVRAYI. 1G5 contour. The width proximally of the antcro-internal surface isabout f) cm., but it narrows rapidly. The posterior contour ofthe shaft is concave. The surface of the bone at the proximal end is moderately concave,with a slight vertical channel for the fibula towards the externalcrest. This is augmented by crushing, in the left tibia, but theimperfect proximal end of the right tibia shows no post-mortemcomj)ress
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
